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Timbangen Sembiring
Physics Department, FMIPA Universitas Sumatera Utara – Medan Indonesia
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Environmental Science Immunology & microbiology Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Neuroscience Physics Social Sciences Other

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COMPARISON OF ENERGY DOSES 10 MV DISTRIBUTION USING PERCENTAGE DEPTH DOSE (PDD) METHOD ON LINAC: ELECTA AND SIEMENS Martha Rianna; Herty Afrina Sianturi; Hariyati Lubis; Awan Pelawi; Timbangen Sembiring; Marhaposan Situmorang
Jurnal Natural Volume 18, Number 2, June 2018
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (496.173 KB) | DOI: 10.24815/jn.v18i2.11133

Abstract

The patient dosing on Linac (Electa and Siemens) can be determined by Source Surface Distance (SSD) technique using Precentage Depth Doses (PDD) method. The study was conducted by measuring PDD to compare the dosage distribution calculations on Linac Electa and Siemens device of photon energy at 10 MV. PDD is done with a 100 cm SSD technique at a depth of 0 to 25 cm. The dose distribution results between the Electrical and the Siemens PDD are almost the same in that the Dmax at 10 MV Siemens photon energy occurs at a depth of 20 mm while the 10 MV Electa photon energy occurs at a depth of 21 mm. Both Linac Electa and Siemens device this at the same energy of 10 MV there is a difference of 95.23%.Keywords: Distrubusi dose, PDD, Photon Energy, Quality File Index
CHARACTERIZATION OF NATURAL IRON SAND FROM KATA BEACH, WEST SUMATRA WITH HIGH ENERGY MILLING (HEM) Martha Rianna; Timbangen Sembiring; Marhaposan Situmorang; Candra Kurniawan; Eko Arief Setiadi; Anggito P Tetuko; Silviana Simbolon; Masno Ginting; Perdamean Sebayang
Jurnal Natural Volume 18, Number 2, June 2018
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (415.577 KB) | DOI: 10.24815/jn.v18i2.11163

Abstract

Iron sand is one of the natural resources in West Sumatra that has not been optimally utilized. One of the potential locations to get this iron sand deposits is the coast of Kata. This study aims to analyze the content and size of the iron grains found on the coast of Kata Padang Beach, West Sumatera Province. Coastal sand samples are extracted using permanent magnets to separate magnetic and non-magnetic materials. Characterization of iron sand using Scanning Electron Microscopy with Energy Dispersive X-ray (SEM-EDX) and Vibrating Sample Magnetometer (VSM). The result of characterization using SEM-EDX shows that iron sand samples contain Fe and O elements derived from Phase Magnetite (Fe3O4).  Keywords: iron sand, magnetic materials, SEM-EDX, VSM
Fabrication and Characterization of SiO2-Fe3O4 Using Co-Precipitation Method EMA SUSANTIKA PERANGIN-ANGIN; Timbangen Sembiring
Journal of Technomaterial Physics Vol. 5 No. 1 (2023): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v5i1.9887

Abstract

The fabrication of SiO2-Fe3O4 has been successfully carried out using the co-precipitation method. The main materials used are silicon dioxide (SiO2) and natural sand (Fe3O4). The calcination was conducted at 180℃ for 2 hours. The morphology, crystal structure, and magnetic properties were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). The XRD pattern shows the effect of the material composition on the crystal structure of SiO2-Fe3O4. The grain size of SiO2-Fe3O4 crystals decreases with the increasing composition of silicon. Results of SEM-EDX show that the composition on morphology SiO2-Fe3O4 is a silicon composition. The VSM result shows that sample 3 (composition 7:3) yielded a coercivity value of 114.60 Oe, remanence of 38.62 emu/g, and magnetization saturation of 76.26 emu/g. The distribution of particle size is 70 nm.
COMPARISON OF ENERGY DOSES 10 MV DISTRIBUTION USING PERCENTAGE DEPTH DOSE (PDD) METHOD ON LINAC: ELECTA AND SIEMENS Martha Rianna; Herty Afrina Sianturi; Hariyati Lubis; Awan Pelawi; Timbangen Sembiring; Marhaposan Situmorang
Jurnal Natural Volume 18, Number 2, June 2018
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v18i2.11133

Abstract

The patient dosing on Linac (Electa and Siemens) can be determined by Source Surface Distance (SSD) technique using Precentage Depth Doses (PDD) method. The study was conducted by measuring PDD to compare the dosage distribution calculations on Linac Electa and Siemens device of photon energy at 10 MV. PDD is done with a 100 cm SSD technique at a depth of 0 to 25 cm. The dose distribution results between the Electrical and the Siemens PDD are almost the same in that the Dmax at 10 MV Siemens photon energy occurs at a depth of 20 mm while the 10 MV Electa photon energy occurs at a depth of 21 mm. Both Linac Electa and Siemens device this at the same energy of 10 MV there is a difference of 95.23%.Keywords: Distrubusi dose, PDD, Photon Energy, Quality File Index
CHARACTERIZATION OF NATURAL IRON SAND FROM KATA BEACH, WEST SUMATRA WITH HIGH ENERGY MILLING (HEM) Martha Rianna; Timbangen Sembiring; Marhaposan Situmorang; Candra Kurniawan; Eko Arief Setiadi; Anggito P Tetuko; Silviana Simbolon; Masno Ginting; Perdamean Sebayang
Jurnal Natural Volume 18, Number 2, June 2018
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v18i2.11163

Abstract

Iron sand is one of the natural resources in West Sumatra that has not been optimally utilized. One of the potential locations to get this iron sand deposits is the coast of Kata. This study aims to analyze the content and size of the iron grains found on the coast of Kata Padang Beach, West Sumatera Province. Coastal sand samples are extracted using permanent magnets to separate magnetic and non-magnetic materials. Characterization of iron sand using Scanning Electron Microscopy with Energy Dispersive X-ray (SEM-EDX) and Vibrating Sample Magnetometer (VSM). The result of characterization using SEM-EDX shows that iron sand samples contain Fe and O elements derived from Phase Magnetite (Fe3O4).  Keywords: iron sand, magnetic materials, SEM-EDX, VSM
Manufacture and Characterization of Pandan Wangi (Pandanus amaryllifolius Roxb) Fiber-Based Composite Board with Epoxy Resin Sembiring, Timbangen
Journal of Technomaterial Physics Vol. 2 No. 1 (2020): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v2i1.5200

Abstract

The manufacture and characterization of pandan wangi fiber-based compositeboards with epoxy resin using random fiber orientation method, fiber length 4 cm, withfiber composition in grams (0, 0.1, 0.2, 0.3, 0.4, 0.5), mechanical and physical testing hasbeen carried out. The results obtained a tensile strength value of 52.26 MPa, flexuralstrength 49.74 MPa, impact strength 30.6 kJ.mm-2, density 1.07 g.cm-3, and moisturecontent 2.05%. The results showed that the mechanical and physical properties that meetthe JIS A5905: 2003 standard are tensile strength > 0.4 MPa, bending strength > 32 MPa,density 0.3-1.3 g.cm-3, and moisture content 5-13 %. Therefore, pandan wangi fibercomposite with epoxy resin can be applied to car bumpers.
Manufacture and Characterization of Supercapacitance Properties of Robusta Coffee Shell-Based Carbon Electrodes Hulu, Frida Margareth; Sembiring, Timbangen
Journal of Technomaterial Physics Vol. 5 No. 1 (2023): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v5i1.10004

Abstract

Supercapacitors, which are able to store large amounts of energy, are a major requirement in energy utilization. In this study, carbon electrodes were produced from robusta coffee shells. The carbon was activated with 0.5 M, 0.7 M, and 3 M of KOH. The results showed that the higher the concentration, the larger and more regular the pores on the carbon and the larger the size. Carbon is produced in an impure state. The specific capacitances produced with 0.5 M, 0.7 M, and 3 M KOH are 0.28 Fg-1, 0.11 Fg-1, and 0.10 Fg-1.
Analysis and Characterization of Fe3O4/Silica Composite from Rice Husk Ash Susilawati, Susilawati; Lubis, Hariyati; Sembiring, Timbangen; Yanti, Jeddah; Pardede, Syahrani Nabilla; Napitupulu, Agnes Federova
Journal of Technomaterial Physics Vol. 6 No. 1 (2024): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v6i1.15975

Abstract

In this investigation, Fe3O4/Silica composites were synthesized from rice husk ash utilizing the coprecipitation technique, aiming to elucidate the influence of variedheating temperatures on the surface morphology and elemental composition of the composites. Comprehensive characterizations were conducted employing FourierTransform Infrared (FTIR) Spectroscopy, X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM). These analyses unveiled a heterogeneous distributionof Fe3O4 nanoparticles and affirmed the amorphous characteristic of the silica constituent, with the XRD results prominently displaying a broad peak at approximately 2θ = 38°, signifying the amorphous nature. Despite the alterations in heating temperatures, SEM observations indicated a negligible effect on the nanoparticles' surface morphology, whereas notable variations were discerned intheir elemental composition. The outcomes of this study provide insightful contributions to the understanding of the structural properties of Fe3O4/Silica composites, suggesting avenues for refining synthesis methodologies for enhanced environmental and technological utilization.
Micro-Magnetic Activity of the Fabricated MnFe2O4 via Co-Precipitation from Natural Iron Sand Rianna, Martha; Hussain, Muhammad Khalid; Sembiring, Timbangen; Guk-Guk, Herwati Permata Indah Raja; Sitorus, Kurnia Jesiska; Setiadi, Eko Arief; Tetuko, Anggito P.; Sebayang, Perdamean
Science and Technology Indonesia Vol. 10 No. 1 (2025): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.1.221-227

Abstract

This study explores the micromagnetic behaviour of MnFe2O4 derived from natural iron sand through the coprecipitation method, without the need for calcination. Using manganese chlo-ride and iron sand as precursors, one can create MnFe2O4. Through the utilisation of X-ray Diffraction (XRD), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX), and Vibrating Sample Magnetometer (VSM), one can effectively analyse and understand the crystal structure, morphology, and magnetic properties. The crystal size was reduced by a fac-tor of 0.40 nm, as revealed by XRD crystal structure analysis. Additionally, the XRD results indicated the absence of impurities, confirming the presence of a single phase. In addition, the SEM analysis revealed that samples 1, 2, and 3 underwent agglomeration. The particles have a cubic shape. The analysis using EDX indicates that there are no other elements present in the Mn, Fe, and O. Additionally, the VSM analysis confirms that the sample exhibits magnetic hardness. Sample 1 exhibits exceptional magnetic properties, with Ms values of 217.53 emu/g, Mr 34.27 emu/g, and Hc 127.42 emu/g. Photoluminescence (PL) spectroscopy was used to observe the optical properties of MnFe2O4. Sample 1 exhibits a distinct emission spectrum at 440 nm, representing the purple band. Sample 2 displays a sharp emission spectrum at 448 nm, indicating the blue band. Lastly, Sample 3 demonstrates a clear emission spectrum at 427 nm, signifying the purple band.
A Adjustable power supply assembly and training on the physics laboratory at YPK Masehi Berastagi Tarigan, Kerista; Timbangen, Timbangen Sembiring; Simamora, Widya; Simamora, Berto; Simatupang, Robin
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 4 No. 2 (2019): ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (978.147 KB) | DOI: 10.32734/abdimastalenta.v4i2.3210

Abstract

Adjustable power supply assembly and training have been conducted to private YPK Berastagi high school students in Berastagi District, Karo. This activity was carried out in partnership with the University of North Sumatra in the form of community service. The purpose of the training and making of this study program is to improve the teaching activities of the theory and practice of the field of electronic physics to partners. The training and making of the study program were carried out using the theory understanding method, assembling and testing it. The main components and functions used are the 220V 5A step down transformer, 5A rectifier diodes as dc rectifiers, 4700 µF electrolyte capacitors as filters, and IC LM 317 regulators as voltage regulators and are equipped with current amplifiers, 2SA 73 transistors and 2SC 41 Based on test and analysis data obtained by students (i), the output voltage can be adjusted from 1.27 - 24.62 volts with a maximum current of 3A. While the ripple voltage, Vr pp = 0.1 Volt. obtained mV. Based on the PS test results of assemblies against the burden of motorcycle lights, 40 Watt works well. Based on these results, the PS can be used.
Co-Authors Achmad Maulana Soehada Sebayang Agung Imaduddin Anggito P Tetuko Anggito P. Tetuko Anggito P. Tetuko, Anggito P. Awan Pelawi Ayu Wahyuni Batubara Candra Kurniawan Cindy Al Kindi Devi Yolanda Simangunsong Eko Arief Setiadi Eko Arief Setiadi Eko Arief Setiadi, Eko Arief Eko Pudjadi, Eko EMA SUSANTIKA PERANGIN-ANGIN Erna Frida Eva Purwanti Ferry Rahmat A. Bukit Fitri Handayani Fynnisa Zebua Guk-Guk, Herwati Permata Indah Raja Hamid, Muhammadin Hariyati Lubis, Hariyati Herty Afrina Sianturi Herty Afrina Sianturi Hulu, Frida Margareth Hussain, Muhammad Khalid Ivo Andika Hasugian Jeddah Yanti Junedi Ginting M Zidan Davy Marhaposan Situmorang Marhaposan Situmorang Marhaposan Situmorang Marhaposan Situmorang Maria Derani Ester Vania Situngkir Martha Rianna Martha Rianna Martha Rianna Martinez Lumbantobing Masno Ginting Mester Sitepu, Mester Moraidah Hasanah Motlan . Muhammad Syafii Muhammadin Hamid Napitupulu, Agnes Federova Nimpan Bangun Pardede, Syahrani Nabilla Perdamean Sebayang Perdamean Sebayang Perdamean Sebayang Pius Sebleku Rahmadsyah Rahmadsyah Rita Juliani Sianturi, Herty Afrina Silviana Simbolon Simamora, Berto Simamora, Widya Simatupang, Robin Sinaga, Antonius Sutanto Sitorus, Kurnia Jesiska Sitorus, Meida Susilawati, Susilawati Syahrul Humaidi, Syahrul Tarigan, Kerista Tua Raja Simbolon Wina Rahmadani Rangkuti Yoga Pratama Zuriah Sitorus